05-30-2019, 07:02 AM | #3 |
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Arguments over how much M is in the M40i aside, I found Number Four in this list to be a good guide on breaking in any new car, let alone a BMW:
https://www.bmw.com/en/automotive-li...a-new-car.html |
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05-30-2019, 09:02 AM | #4 | |
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05-30-2019, 10:20 AM | #5 | |
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Note: I just reread the guidelines at the link referred to above for buying a new BMW; which included the break in period. It's possible the quote above is only referring to the initial oil change for "M" and "i" cars, not the break in period; it's not clear. Ugh, the downside of being anal. Last edited by sanfordrich; 05-30-2019 at 10:34 AM.. Reason: Embedded quote might not apply |
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05-30-2019, 10:33 AM | #6 | |
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05-30-2019, 10:34 AM | #7 |
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For what it's worth. On all my BMW's I've always tried to keep the RPM's down/no flooring it for the first 1000 miles, then do an oil change. Yes it won't be covered since the car isn't calling for it, but do it anyways And make sure they don't reset the oil mileage counter, so you get your paid one sooner.
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05-30-2019, 10:36 AM | #8 |
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Manual for the M40i says 1200 miles (vary engine speed, no kick down, don’t exceed I think it was 4K RPM (verrrry hard to stay below); less for tires and brakes.
Related question: I know it’s not absolutely necessary for engine oil, but would like to have oil and M diff fluid (oil?) changed after break in period. Opinions, especially on diff? I asked my dealer for pricing a couple weeks ago and the car is so new, they couldn’t tell me price for either one. Settled for approximates using 4 series pricing. Diff fluid change is expensive! |
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05-30-2019, 11:42 AM | #9 |
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Thanks for correcting my assumption; glad to know; it also means the recommendation in the link to the BMW site applies to the 2019 / 20 Z cars.
Last edited by sanfordrich; 05-30-2019 at 11:48 AM.. |
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05-30-2019, 11:47 AM | #10 | |
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05-30-2019, 02:02 PM | #11 | |
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05-30-2019, 03:54 PM | #12 |
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Is breaking in these modern engines really necessary? There's a lot of word out there that it's a thing of the past.
For what it's worthI'm due to pick up my M40i on Saturday. |
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05-30-2019, 04:04 PM | #13 |
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Shoot- I didn't expect an image from the manual but much thanks.
There are varied opinions about break in period, but as I said earlier, I prefer to go with the manufacture's recommendation. What bothers me a bit is when I test drive brand new vehicles with 15 or 20 miles on them and the salesman claims it won't be a problem for the vehicle if I drive it like it's already broken in. I am sure some people agree with that but the manufacturer says to break it in. That's one reason I prefer to purchase a high performance vehicle as a special order and hopefully the dealer will respect the break in period before it's delivered to the customer. |
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05-31-2019, 08:49 AM | #14 |
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I know what BMW recommends for breakin on new vehicles, and I did it on 3 of my 4 new BMWs in the past 3 years. But I did not follow breakin procedure on my z4 m40i. Only time will tell how it adversely affected things, but here's the breakdown so far:
'17 m240ix - needed new turbo at 1000 miles due to oil leak at return line from turbo. Followed breakin directions. drove it for 32k miles. Did oil change after first 1200 miles (because I drove it 200 miles with the minor oil leak before dealer could get me in. Oil change is part of the turbo replacement procedure), no diff changes. '17 x1 xdrive - no mechanical issues at all in the 30k miles we drove it. no breakin oil change, first was at 10k miles. followed breakin directions '19 x3 m40i - no mechanical issues so far. Had first oil change already (sitting just over 10k miles). Followed breakin directions. '20 z4 m40i - no mechanical issues so far. Haven't done any oil changes or diff changes (sitting at 2k miles). Did not follow breakin directions and engine still runs smooth, trasmission is same as new, no ill affects so far. Granted, the z4 got a 150 mile drive back home from the dealership through a downpour so it cruised between 50-80mph on the highway several times. around 250 miles I started doing some WOT runs because why not and have driven it hard ever since. |
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05-31-2019, 08:59 AM | #15 |
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For the most part the break in procedure is a liability protection from BMW. I am not saying you should not follow it, but it will be unlikely you can trace any damage years later back to you not following it.
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05-31-2019, 09:14 AM | #16 | |
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05-31-2019, 09:39 AM | #17 |
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Engines 20 years ago were not manufactured the same as modern engines. Different times call for different measures. Same reason you had 3k oil change intervals back then, but 10k now.
Always best to Er on the side of caution though I plan on keeping mine for a few years at least, but I don’t see myself driving it in 20 years. I’m one of those “gotta have the newer tech” kind of people. Not one of the first to buy usually, but I’m within the first year or so most of the time. |
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05-31-2019, 09:39 AM | #18 | |
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05-31-2019, 12:05 PM | #19 |
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I wonder if the break in period is as much for the driver (or even more so) than it is for the car ... takes some time to get comfortable with everything, set everything up, not being distracted by all the nice screens, ...
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05-31-2019, 12:16 PM | #20 |
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I strongly suspect it's just a way to very slightly reduce warranty claim costs for BMW. If it were anything more serious they would take a stronger stance like denying warranty coverage if you didn't follow the guidelines.
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05-31-2019, 01:35 PM | #21 |
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Fortunately cars don't have black boxes, yet
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05-31-2019, 01:54 PM | #22 |
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